/*******************************************************************************
 * Copyright 2007, 2009 InnovaSoft SA http://www.innovasoft.biz/
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *       http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/

package biz.innovasoft.nodb.query;

import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;

public class BinaryExpression extends Expression {

	public final Operator operator;
	public final Expression left;
	public final Expression right;

	public BinaryExpression(Operator op, Expression left, Expression right) {
		this.operator = op;
		this.left = left;
		this.right = right;
	}

	public static BinaryExpression and(Expression left, Expression right) {
		return new BinaryExpression(Operator.AND, left, right);
	}

	public static BinaryExpression or(Expression left, Expression right) {
		return new BinaryExpression(Operator.OR, left, right);
	}

	public static BinaryExpression eq(Expression left, Expression right) {
		return new BinaryExpression(Operator.EQUAL, left, right);
	}

	public String toString() {
		switch (operator) {
		case AND:
			return "(" + left.toString() + " AND " + right.toString() + ")";
		case OR:
			return "(" + left.toString() + " OR " + right.toString() + ")";
		}
		return "";
	}
	
	public boolean equals(Object obj) {
		return EqualsBuilder.reflectionEquals(this, obj);
	}

	public int hashCode() {
		return HashCodeBuilder.reflectionHashCode(this);
	}

}
